23 Questions
Why do humans create devices to lift and move things?
To use less effort or create a greater force
What is friction?
The resistance between surfaces that come in contact with each other
How can friction be reduced between surfaces?
By using smooth and hard surfaces
What creates the force needed to move a device?
Simple forces
Why do devices use parts to store and use energy?
To store energy and use (consume) energy
What happens when a compressed spring in a winding mechanism is released?
It sets things in motion
What is the purpose of simple machines in devices?
To create a greater force with less effort
What is the role of moving air and water in devices?
To assist in moving parts of mechanisms
How does reducing friction help in making parts move better?
By decreasing the amount of surface the parts touch
Why do loose moving parts have an advantage over tight moving parts?
Loose parts have less friction than tight parts
What is the purpose of winding mechanisms in devices?
To store energy in a compressed spring
Why do designers use a variety of simple machines in devices?
To solve different problems effectively
What happens when an object moves down a slope?
It picks up speed due to gravity
How does using smooth and hard surfaces reduce friction?
By decreasing the amount of surface the parts touch.
Why do devices need a force to move?
To set things in motion.
What is the primary reason why humans create devices to lift and move things?
To create a greater force
How does reducing friction help in making parts move better?
By decreasing the amount of surface parts touch
What is the effect of an object moving down a slope?
It picks up speed
How do winding mechanisms in devices work?
By using compressed springs to cause movement
How can moving air and water contribute to moving parts of mechanisms?
By aiding movement
What happens when an object moves down a slope, and friction is reduced?
It speeds up the object
Why do loose moving parts have an advantage over tight moving parts?
Loose parts move more easily
What is the main purpose of using smooth and hard surfaces instead of bumpy surfaces to reduce friction?
To decrease the amount of surface the parts touch and cause friction
Test your knowledge on simple machines such as wedges, pulleys, and inclined planes. Learn about their uses and how they make work easier.
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